Ajax Contact Form Resource

PHP Code:
--------------
<?php

    // Only process POST reqeusts.
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        // Get the form fields and remove whitespace.
        $name = strip_tags(trim($_POST["name"]));
				$name = str_replace(array("\r","\n"),array(" "," "),$name);
        $email = filter_var(trim($_POST["email"]), FILTER_SANITIZE_EMAIL);
        $lname = trim($_POST["lname"]);
        $subject = trim($_POST["subject"]);
        $message = trim($_POST["message"]);

        // Check that data was sent to the mailer.
        if ( empty($name) OR empty($subject) OR empty($lname) OR empty($message) OR !filter_var($email, FILTER_VALIDATE_EMAIL)) {
            // Set a 400 (bad request) response code and exit.
            http_response_code(400);
            echo "Please complete the form and try again.";
            exit;
        }

        // Set the recipient email address.
        // FIXME: Update this to your desired email address.
        $recipient = "[email protected]";

        // Set the email subject.
        $subject = "New contact from $name";

        // Build the email content.
        $email_content = "First Name: $name\n";
        $email_content = "Last Name: $lname\n";
        $email_content .= "Email: $email\n\n";
        $email_content .= "Subject: $subject\n\n";
        $email_content .= "Message:\n$message\n";

        // Build the email headers.
        $email_headers = "From: $name <$email>";

        // Send the email.
        if (mail($recipient, $subject, $email_content, $email_headers)) {
            // Set a 200 (okay) response code.
            http_response_code(200);
            echo "Thank You! Your message has been sent.";
        } else {
            // Set a 500 (internal server error) response code.
            http_response_code(500);
            echo "Oops! Something went wrong and we couldn't send your message.";
        }

    } else {
        // Not a POST request, set a 403 (forbidden) response code.
        http_response_code(403);
        echo "There was a problem with your submission, please try again.";
    }

?>





Ajax jQuery 
----------------------
$(function() {

	// Get the form.
	var form = $('#contact-form');

	// Get the messages div.
	var formMessages = $('.form-message');

	// Set up an event listener for the contact form.
	$(form).submit(function(e) {
		// Stop the browser from submitting the form.
		e.preventDefault();

		// Serialize the form data.
		var formData = $(form).serialize();

		// Submit the form using AJAX.
		$.ajax({
			type: 'POST',
			url: $(form).attr('action'),
			data: formData
		})
		.done(function(response) {
			// Make sure that the formMessages div has the 'success' class.
			$(formMessages).removeClass('error');
			$(formMessages).addClass('success');

			// Set the message text.
			$(formMessages).text(response);

			// Clear the form.
			$('#contact-form input,#contact-form textarea').val('');
		})
		.fail(function(data) {
			// Make sure that the formMessages div has the 'error' class.
			$(formMessages).removeClass('success');
			$(formMessages).addClass('error');

			// Set the message text.
			if (data.responseText !== '') {
				$(formMessages).text(data.responseText);
			} else {
				$(formMessages).text('Oops! An error occured and your message could not be sent.');
			}
		});
	});

});